Elastic-fluid turbine.



F. W. KENNEDY.

ELASTIC FLUID TURBINE.

APPLICATION FILED NOV-7.1913.

Patented Feb. 8, 1916.

' INVENTDR:

WITNESSES:

THE COLUMBIA PLANOGRAPH 60., WASHINGTON, D. C.

FRANK w. KENNEDY, or rann ron, new .annsnr, assienoa To an Lava" s'rneir ruasina coraranr, new roan, n. a corronarion or .naass ritual-r7.

Application filed November 7, 1913.

To aZZ whom may concern Be it known that l, FRANK VJ. KENNEDY, a citizen of the United States of America, and a resident of Trenton, in the county of Mercer and State of New Jersey, have invented certain new and useful Improvements in Elastic-Fluid Turbines, of which the following is a specification.

My invention relates to elastic fluid turbines, such a steam turbines, and particularly to meansfor limiting, to a predetermined maximum, the speed of such turbines.

My invention comprises a turbine rotor provided with fan blades arranged to interpose a progressively increasing resistance to rotation, as the speed of rotation rises.

Uther features of my invention will be set forth hereafter.

My invention is particularly applicable to small and relatively inexpensive fluid pressure turbines, in which simplicity and compactness is particularly required.

The object of my invention is to improve means for controlling the speed of elastic fluid turbines, and to make the speed control device very simple and compact.

I will now proceed to describe my invention with reference to the accompanying drawing, in which Figure 1 shows a longitudinal axial section of a simple form of turbine embodying one form of my speed regulating device, and F 2 shows an end view of the turbine.

In the drawings, 1 designates the turbine casing, and 2 a removable cover for such casing, which cover carries the turbine nozzle 3.

l designates the rotor or bucket-carrying disk of the turbine, 5 the rotor shaft and 6 a bracket having a bearing for such shaft.

7'? designate the buckets of the turbine.

8-8 designate fan blades with which the rotor disk 4 is provided. 99 and 10 designate air inlet openings, located near the center of the turbine casing, and 11 designates an exhaust opening for the escape of the exhaust motive fluid and of air.

The turbine herein described is particularly intended for operating a small high speed electric generator (not shown, but which will be connected to the rotor shaft in any suitable manner). The nozzles 3 of the turbine will be proportioned to give the ntasric rtuin TURBINE.

Specification of Letters Patent.

Patented Feb. E5, 1916..

Serial No. 799,743.

full load of the generator at a certain speed, for instance 3660 revolutions per minute, at a predetermined steam pre ure. The t rbine is intended to operate without any an tomatic governor-valve mechanism. During the operation of the turbine the fan blades 8 draw air through the openings 9 -9 and 10 into the turbine casing and force such air outward through the exhaust opening 11, with the exhaust motive fluid. its the speed of the rotor rises from zero, the fan blades 8 necessarily oppose an increasing resistance r to the rotation of the rotor, but are so designed t iat such resistance is not detrimental up to the intended normal running speed 3600 revolutions per minute in the instance assumed). if, while the turbine is in full operation, the load should be thrown off or greatly decre sed (for example, suppose the load to be thrown off the generator driven by the turbine as previously stated), the speed of rotation will necessarily in crease to a certain extent, but the resistance offered by the fan blades will increase to a.

greater extent, and to such an extent that when a speed of say 4l600 to 4800 revolutions per minute has been reached an equilibrium between the power geneaited by the action shaftto prevent escape of steam around the shaft. In practice, the rotor disk employed is a cast disk, and the fan blades 8 are united to that disk by placing such blades in the mold in which the disk is cast, and casting the metal of the disk around said blades. Bythis method of construction it is possible to produce a weld union between the blades 8 and the metal of the disk.

What I claim is:

1. In a fluid pressure turbine, the combination, with a rotor disk, of a fixed fan blade mounted thereon to rotate therewith, and of a size, and so disposed, as to interpose effective progressively increasing resistance to motion of such rotor as the speed thereof rises.

2. In an elastic fluid turbine, the combination, With a rotor disk, of fixed fan blades secured to and projecting therefrom and arranged to travel in an air space surrounding such rotor, and of such size, and so disposed, as by their fan action to offer a progressively increasing efiective resistance to motion of the rotor as the velocity of such rotor increases.

' 3. A turbine rotor disk provided With turbine buckets and also provided With fixed fan blades projecting from it and of such size and so arranged as to offer effective pro- Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patentsgressively increasing resistance to motion of such rotor as the Velocity of such rotor increases. p a

4. A turbine rotor disk formed of cast metal and provided With buckets and also C. R. WALLER, A. PETERSON.

Washington, I). G. 

